Craig Mayer, Nick WIlliams, Vojtech Huser
Lister Hill National Center for Biomedical Communications, National Library of Medicine, NIH, Bethesda, MD

See the full regCTG repository at https://github.com/lhncbc/CRI/tree/master/regCTG

To return to the list of conditions and view other reports go to https://lhncbc.github.io/CRI/regCTG/regCTG-condition_report_links.html


Study Counts

Type Study_count
Total_Studies 3550
interventional 3109
Observational 414
Registry 27

Studies over Time

```

Interventional Trials

Intervention Type

intervention_type Study_Count
Behavioral 990
Drug 576
Drug|placebo 517
Device 272
Other 259
Behavioral|Other 114
Behavioral|Drug 67
Procedure 44
Dietary Supplement|placebo 23
Dietary Supplement 22
Drug|Procedure 22
Drug|Other 20
Behavioral|Drug|placebo 15
Behavioral|placebo 13
Behavioral|Device 12
Behavioral|Other|Procedure 10
Device|Other 10
Device|Drug|placebo 8
Other|Procedure 8
Behavioral|Drug|Other 7
Device|Drug 7
Biological 6
Drug|Other|placebo 6
Dietary Supplement|Drug 5
Genetic 5
Behavioral|Drug|Procedure 4
Biological|placebo 4
Other|placebo 4
Behavioral|Device|Other 3
Behavioral|Procedure 3
Device|placebo 3
Device|Procedure 3
Dietary Supplement|Drug|placebo 3
Dietary Supplement|Other 3
placebo|Procedure 3
Behavioral|Device|Drug 2
Behavioral|Dietary Supplement|placebo 2
Combination Product 2
Combination Product|placebo 2
Diagnostic Test|Other 2
Drug|placebo|Procedure 2
Genetic|Other 2
placebo 2
Behavioral|Biological 1
Behavioral|Biological|Diagnostic Test|Other 1
Behavioral|Device|placebo 1
Behavioral|Diagnostic Test 1
Behavioral|Diagnostic Test|Other 1
Biological|Device 1
Biological|Device|Other 1
Biological|Dietary Supplement|placebo 1
Biological|Drug 1
Combination Product|Device 1
Combination Product|Drug|Other 1
Combination Product|Other 1
Device|Diagnostic Test|Drug|Other 1
Device|Drug|Other|placebo 1
Device|Other|placebo 1
Device|Other|Radiation 1
Diagnostic Test 1
Diagnostic Test|Drug 1
Dietary Supplement|Drug|Other 1
Drug|Genetic 1
Drug|Other|Procedure 1
Drug|Radiation 1

Count of Studies by Intervention (normalized and mapped)

Interventions over Time

Weekly studies for each intervention

Studies by Country

Country Study_Count
United States 1574
Canada 203
NA 193
Germany 89
China 75
United Kingdom 64
France 54
Sweden 48
Denmark 40
Japan 40
Brazil 37
Spain 37
Australia 31
Hong Kong 31
Norway 30
Korea, Republic of 29
Taiwan 28
Israel 25
Netherlands 22
Pakistan 22
United States|Canada 20
Switzerland 16
United States|Puerto Rico 16
Belgium 14
India 13
Italy 13
Turkey 13
Finland 10
Ireland 10
Poland 9
Austria 8
Chile 8
Egypt 7
Mexico 7
Singapore 7
Iran, Islamic Republic of 5
Romania 5
South Africa 5
Uganda 5
Colombia 4
United States|Australia 4
Germany|Switzerland 3
Kenya 3
Malawi 3
Malaysia 3
Russian Federation 3
United States|China 3
Vietnam 3
Croatia 2
Germany|Netherlands 2
Japan|Korea, Republic of 2
Japan|Taiwan 2
Philippines 2
Portugal 2
United States|Canada|Germany|Israel 2
United States|India 2
United States|Israel 2
United States|Mexico 2
Argentina 1
Argentina|Belgium|Chile|Costa Rica|Germany|Italy|Peru|Poland|Slovakia|Spain|Sweden 1
Argentina|Brazil|Bulgaria|Chile|Colombia|Croatia|France|Germany|Hungary|Poland|Romania|Russian Federation|Serbia|Slovakia|South Africa|Spain|Ukraine 1
Argentina|Brazil|Chile|Colombia|Guatemala|Mexico|Peru|Turkey|Venezuela 1
Argentina|Bulgaria|Canada|Chile|Croatia|Mexico|Russian Federation 1
Argentina|Bulgaria|Croatia|Czech Republic|Finland|France|Mexico|Poland|Romania|Russian Federation|Serbia|Slovakia|South Africa 1
Argentina|Chile|Greece|Hong Kong|Morocco|Russian Federation|Singapore|South Africa|Spain|Taiwan|Tunisia 1
Australia|Austria|Belgium|Canada|Czech Republic|Finland|France|India|Korea, Republic of|Lithuania|Malaysia|Norway|Philippines|Russian Federation|Serbia|Sweden|Ukraine 1
Australia|Belgium|Bulgaria|Canada|Estonia|Finland|France|Germany|India|Poland|Slovakia|South Africa 1
Australia|Belgium|Canada|Czech Republic|Finland|France|Germany|Norway|Poland|Romania|South Africa|Sweden 1
Australia|Belgium|Finland|Netherlands|Norway|Russian Federation 1
Australia|Canada|Mexico|Russian Federation|Taiwan 1
Australia|Czech Republic|France|Germany|Korea, Republic of|Latvia|Lithuania|Malaysia|Netherlands|Poland|Russian Federation|South Africa|Taiwan|Ukraine|United Kingdom 1
Australia|Japan|Korea, Republic of|Malaysia|Taiwan 1
Australia|Singapore 1
Australia|Turkey 1
Austria|Croatia|France|Hungary|Poland|Romania|Russian Federation|Serbia|Ukraine|United Kingdom 1
Austria|Czech Republic|Germany 1
Austria|Czech Republic|Italy|Romania|Slovakia|Spain 1
Austria|Finland|France|Germany|Italy|Netherlands|Norway|Romania|Russian Federation|South Africa|Spain|Sweden|Ukraine 1
Austria|Germany 1
Bangladesh 1
Belgium|Czech Republic|Finland|France|Germany|Slovakia 1
Belgium|Estonia|Finland|France|Germany|Greece|India|Korea, Republic of|Malaysia|Morocco|Taiwan|Tunisia|Turkey 1
Belgium|Germany|Netherlands 1
Belgium|Germany|Poland 1
Bolivia 1
Brazil|Bulgaria|Chile|Czechia|Germany|Hungary|Japan|Mexico|Poland|Russian Federation|Slovakia|South Africa 1
Brazil|United States|Belgium|Canada|Estonia|France|Hungary|Mexico|Slovakia 1
Bulgaria|Canada|Chile|Costa Rica|Croatia|France|Germany|India|Italy|Poland 1
Bulgaria|Croatia|Former Serbia and Montenegro|Romania 1
Bulgaria|Croatia|Romania|Serbia 1
Bulgaria|Czechia|Finland|Hungary|Russian Federation|Slovakia|Ukraine 1
Bulgaria|Estonia|France|Germany|Hungary|Italy|Latvia|Poland|Russian Federation|Serbia|South Africa|Spain|United Kingdom 1
Bulgaria|Estonia|Latvia 1
Bulgaria|Finland|Romania|Serbia|Slovakia 1
Bulgaria|Hungary|Moldova, Republic of|Romania|Russian Federation|Ukraine 1
Canada|Chile|Croatia|Czech Republic|France|Germany|Mexico|Portugal 1
Canada|Chile|Croatia|Czechia|Estonia|Germany|Mexico|Portugal 1
Canada|Croatia|Estonia|Germany|Indonesia|Korea, Republic of|Latvia|Lithuania|Malaysia|Norway|Philippines|Poland|Russian Federation|Serbia|Taiwan|Ukraine 1
Chile|Mexico|Romania|Russian Federation|Slovakia|South Africa|Ukraine 1
China|Hong Kong 1
Costa Rica 1
Croatia|Estonia|Finland|France|Latvia|Lithuania|Poland|Romania|Slovakia|South Africa 1
Cuba 1
Czech Republic|Estonia|Finland|France|Germany|Hungary|Latvia|Lithuania|Poland|Sweden 1
Denmark|France|Greece|Hungary|Italy|Netherlands|Romania|Slovenia|Spain|Sweden|Turkey 1
Denmark|Iceland|Italy|Poland|Spain 1
Estonia|Finland 1
Estonia|Finland|Germany|Lithuania 1
Estonia|Finland|Germany|Serbia|Slovakia 1
Estonia|France|Italy|Korea, Republic of|Poland|Spain 1
Estonia|Russian Federation 1
Estonia|United States|Belgium|Czechia|Finland|Germany|Hungary|Poland|Romania|South Africa|Sweden 1
Finland|Germany|Poland|Bulgaria|United States|Russian Federation|Ukraine 1
Finland|Germany|Serbia|Slovakia 1
Finland|Poland|Russian Federation|Serbia|Slovakia|South Africa|Ukraine|United Kingdom 1
Finland|Sweden 1
France|Germany|Netherlands|Spain|United Kingdom 1
France|Israel|United Kingdom 1
France|Italy|Lithuania|Spain 1
France|Monaco 1
Germany|Netherlands|Spain|United Kingdom 1
Guatemala 1
Haiti 1
Hungary 1
Iceland 1
India|China|Korea, Republic of|Taiwan 1
Indonesia 1
Iraq 1
Italy|Australia|Austria|Belgium|Bulgaria|Denmark|Germany|Hungary|Portugal|Romania|Slovakia|Spain|United Kingdom 1
Italy|Poland 1
Japan| 1
Japan|Lithuania|Malaysia|Philippines|Russian Federation|Slovakia|Taiwan|Ukraine 1
Japan|United States 1
Japan|United States|Bulgaria|Poland|Russian Federation|Serbia|Slovakia|Ukraine 1
Kosovo 1
Lebanon 1
Mexico|Canada|China|Finland|Korea, Republic of|Malaysia|Philippines|South Africa|Spain 1
Moldova, Republic of|Romania 1
Nepal 1
Netherlands|Spain 1
Netherlands|Switzerland 1
Peru 1
Poland|Spain|United States|Czechia|Germany 1
Poland|United States|Belgium|Brazil|Bulgaria|Finland|France|Lithuania|South Africa|Spain|Sweden|United Kingdom 1
Puerto Rico 1
Russian Federation|Austria 1
Russian Federation|United States|Austria|Canada|Germany|Slovakia|South Africa|Ukraine 1
Rwanda 1
Serbia|United States|Bulgaria|Canada|Colombia|Estonia|France|Germany|Hungary|Israel|Italy|Korea, Republic of|Latvia|Mexico|Poland|Russian Federation|South Africa|Spain|Ukraine|United Kingdom 1
Serbia|United States|Canada|France|Germany|Poland|Russian Federation 1
Serbia|United States|Russian Federation|Ukraine|United Kingdom 1
Spain|Sweden|United Kingdom 1
Spain|United States|Belgium|Brazil|Canada|Czechia|Estonia|France|Germany|Hungary|Mexico|Poland|Slovakia|Sweden|Turkey 1
Tanzania 1
Thailand 1
Ukraine 1
Ukraine|Croatia|Finland|Germany|Hong Kong|India|Japan|Korea, Republic of|Latvia|Malaysia|Philippines|Poland|Romania|Russian Federation|Serbia|Taiwan 1
United Kingdom|United States|Moldova, Republic of|Russian Federation|Spain|Ukraine 1
United States|Argentina|Australia|Austria|Belgium|Brazil|Bulgaria|Canada|Czechia|Estonia|Finland|France|Germany|Hungary|Italy|Korea, Republic of|Lithuania|Malaysia|Mexico|Poland|Slovakia|South Africa|Spain|Sweden|Taiwan|Turkey|United Kingdom 1
United States|Argentina|Australia|Austria|Belgium|Brazil|Bulgaria|Finland|France|Germany|Korea, Republic of|Lithuania|Malaysia|Mexico|Poland|South Africa|Spain|Sweden|Taiwan|Turkey|United Kingdom 1
United States|Argentina|Australia|Austria|Canada|France|India|Italy|Puerto Rico|South Africa|Spain|United Kingdom 1
United States|Argentina|Australia|Bulgaria|Canada|France|Poland|South Africa|Spain|Ukraine 1
United States|Argentina|Australia|Chile|United Kingdom 1
United States|Argentina|Austria|Belgium|Brazil|Canada|Czechia|France|Lithuania|Poland|Spain|Turkey 1
United States|Argentina|Belgium|Brazil|Bulgaria|Germany|Spain 1
United States|Argentina|Belgium|Croatia|France|Germany|Greece|Italy|Korea, Republic of|Mexico|Puerto Rico|Romania|Russian Federation|Slovakia|Spain|Turkey 1
United States|Argentina|Brazil|Bulgaria|Croatia|Finland|Germany|Hungary|Italy|Poland|Serbia|Slovakia|South Africa|Ukraine 1
United States|Argentina|Canada|Mexico 1
United States|Argentina|Chile|Colombia|Mexico|Peru 1
United States|Argentina|Estonia|Finland|Russian Federation|Ukraine 1
United States|Argentina|Finland|France|Mexico|Sweden 1
United States|Argentina|Finland|Poland|Russian Federation 1
United States|Argentina|India|Mexico|Puerto Rico|Russian Federation|South Africa|Turkey 1
United States|Australia|Austria|Belgium|Germany|Sweden|United Kingdom 1
United States|Australia|Bulgaria|Canada|Germany|Hungary|Poland|Puerto Rico 1
United States|Australia|Canada 1
United States|Australia|Canada|France|Korea, Republic of|United Kingdom 1
United States|Australia|Chile|Colombia|Costa Rica|Greece|Mexico|Peru|Romania|South Africa|Turkey 1
United States|Australia|Croatia|France|Germany|Korea, Republic of|Latvia|Lithuania|Malaysia|Netherlands|Poland|Russian Federation|Serbia|South Africa|Taiwan|Ukraine|United Kingdom 1
United States|Australia|India 1
United States|Australia|Netherlands|New Zealand|South Africa 1
United States|Australia|Puerto Rico 1
United States|Belgium|Brazil|Bulgaria|France|Hungary|Italy|Poland|Spain 1
United States|Belgium|Germany|Netherlands|United Kingdom 1
United States|Belgium|Japan 1
United States|Bosnia and Herzegovina|Croatia|Germany|Hungary|Romania|Russian Federation|Spain 1
United States|Brazil|Chile|Lithuania|Mexico|Netherlands|Spain 1
United States|Bulgaria 1
United States|Bulgaria|Canada|Colombia|Estonia|France|Germany|Hungary|Israel|Italy|Korea, Republic of|Latvia|Mexico|Poland|Russian Federation|Serbia|South Africa|Spain|Ukraine|United Kingdom 1
United States|Bulgaria|Canada|Colombia|Estonia|France|Germany|Hungary|Italy|Korea, Republic of|Latvia|Mexico|Poland|Russian Federation|Serbia|South Africa|Spain|Ukraine|United Kingdom 1
United States|Bulgaria|Canada|Colombia|Russian Federation|Ukraine 1
United States|Bulgaria|Canada|Estonia|Finland|Germany|Korea, Republic of|Latvia|Lithuania|Mexico|Poland|Romania|Russian Federation|Sweden|Ukraine|United Kingdom 1
United States|Bulgaria|Canada|Puerto Rico|Romania|Russian Federation|Slovakia|United Kingdom 1
United States|Bulgaria|Colombia|France|Hungary|Korea, Republic of|Mexico|Philippines|Poland|Puerto Rico|Ukraine 1
United States|Bulgaria|Colombia|Russian Federation|Serbia|Ukraine 1
United States|Bulgaria|Croatia|Puerto Rico|Romania|Serbia|Slovakia|Ukraine 1
United States|Bulgaria|Estonia|Germany|Hungary|Korea, Republic of|Malaysia|Slovakia|South Africa|Spain|Taiwan 1
United States|Bulgaria|Estonia|Germany|Hungary|Ukraine 1
United States|Bulgaria|Estonia|Germany|Russian Federation 1
United States|Bulgaria|Estonia|Lithuania|Poland|Puerto Rico 1
United States|Bulgaria|Finland|France|Germany|Japan|Russian Federation|Ukraine 1
United States|Bulgaria|Finland|Germany|Romania|Russian Federation|Serbia|Ukraine 1
United States|Bulgaria|Finland|Poland 1
United States|Bulgaria|Hungary|Romania 1
United States|Bulgaria|Russian Federation|Serbia|Ukraine 1
United States|Canada|Chile|Colombia|Croatia|Estonia|Finland|France|Latvia|Lithuania|Poland|Romania|Slovakia|South Africa 1
United States|Canada|Colombia|Czech Republic|France|India|Japan|Lithuania|Peru|Poland|Romania|Russian Federation|Slovakia|South Africa|Ukraine 1
United States|Canada|Colombia|Czech Republic|India|Japan|Lithuania|Peru|Slovakia|Ukraine 1
United States|Canada|Croatia|Mexico|Puerto Rico|Spain 1
United States|Canada|Czechia|Denmark|Ireland|Netherlands|Portugal|Spain|United Kingdom 1
United States|Canada|Finland|France|South Africa|Sweden 1
United States|Canada|France|Germany|Hungary|Poland|Romania|Russian Federation|Serbia|Slovakia|Ukraine 1
United States|Canada|France|Germany|Israel 1
United States|Canada|France|Italy|Spain 1
United States|Canada|France|Poland|Slovakia 1
United States|Canada|Germany|Hungary|Romania|Russian Federation|Ukraine 1
United States|Canada|Germany|Puerto Rico 1
United States|Canada|Israel 1
United States|Canada|Italy|Spain 1
United States|Canada|Mexico 1
United States|Canada|Poland|Russian Federation|United Kingdom 1
United States|Canada|Puerto Rico 1
United States|Chile 1
United States|Chile|Estonia|Germany|Korea, Republic of|Mexico|Russian Federation|South Africa 1
United States|Chile|Estonia|Russian Federation 1
United States|Chile|Germany|Japan|Mexico|Poland|Romania|Russian Federation|Taiwan 1
United States|Chile|Mexico 1
United States|Chile|Slovakia|South Africa 1
United States|Colombia|India|Mexico|Serbia|South Africa|Taiwan 1
United States|Croatia|Czech Republic|France|Mexico|Russian Federation|Sweden|Turkey 1
United States|Croatia|Czechia|Finland|Japan|Puerto Rico|Slovakia 1
United States|Czech Republic|France|Germany|India|Poland|Romania|Russian Federation|South Africa|Ukraine 1
United States|Czech Republic|France|India|Romania|Russian Federation|South Africa|Ukraine 1
United States|Czechia|Finland|Germany|Greece|Israel|Poland|Russian Federation|Spain 1
United States|Czechia|Finland|Poland|Puerto Rico|Slovakia 1
United States|Estonia|Finland|Former Serbia and Montenegro|France|Germany|Latvia|Lithuania|Poland|Slovakia|South Africa 1
United States|Estonia|Finland|Slovakia|Sweden|Ukraine 1
United States|Finland|Poland|Russian Federation|Serbia|Slovakia|Ukraine|United Kingdom 1
United States|France|Germany|Italy|Russian Federation|Sweden 1
United States|France|Germany|Japan|Netherlands|Singapore|Spain 1
United States|France|Germany|Puerto Rico|Romania|Sweden 1
United States|France|Germany|Russian Federation|Slovakia|South Africa|Ukraine 1
United States|Germany 1
United States|Germany|Hungary|Poland|Slovakia 1
United States|Germany|Moldova, Republic of|Russian Federation|Ukraine|United Kingdom 1
United States|India|Puerto Rico 1
United States|Italy 1
United States|Japan|Latvia|Poland|Russian Federation|South Africa|Ukraine 1
United States|Kenya|Tanzania 1
United States|Russian Federation 1
United States|South Africa 1
United States|Spain 1
United States|Taiwan 1
Zambia 1
Zimbabwe 1

Sites per Study

Site_count Study_Count
1 2177
2 273
3 86
4 73
5 29
6 35
7 20
8 22
9 18
10 10
11 8
12 12
13 11
14 10
15 10
16 9
17 7
18 7
19 6
20 6
21 8
22 8
23 6
24 7
25 10
26 5
27 5
28 2
29 3
30 2
31 5
32 10
33 4
34 6
35 6
36 4
37 8
38 6
39 2
40 5
41 3
42 3
43 9
44 7
45 5
46 3
47 7
48 3
49 3
50 5
51 5
52 2
53 4
54 3
55 4
56 5
57 2
58 3
59 2
60 2
61 5
62 3
63 3
65 1
66 4
67 1
68 1
69 2
70 4
71 4
72 2
73 3
74 4
75 2
76 4
77 2
78 3
79 2
82 1
83 1
84 1
85 3
87 2
88 1
89 2
90 1
91 1
92 4
93 1
94 1
99 1
101 2
106 1
107 1
110 1
117 1
124 1
128 1
130 1
136 1
137 1
144 1
149 1
151 1
158 1
160 1
168 1
363 1

Phase

Phase Study_Count
N/A 1695
Phase 3 395
Phase 4 361
Phase 2 340
Phase 1 150
Phase 2/Phase 3 79
Phase 1/Phase 2 53
Early Phase 1 36

Number of Arms

Number_of_Arms Count_of_Studies
1 461
2 1800
3 376
4 151
5 22
6 12
7 6
8 5
9 1
10 2
11 1
13 1
14 1
16 1
NA 269

Number of Updates

Count of Versions Count of Studies
1 299
2 399
3 408
4 325
5 312
6 269
7 192
8 189
9 123
10 85
11 84
12 68
13 53
14 39
15 23
16 34
17 20
18 15
19 8
20 7
21 11
22 8
23 12
24 4
25 4
26 8
27 10
28 5
29 8
30 9
31 13
32 2
33 5
34 2
35 3
36 3
37 7
38 1
39 5
40 4
41 3
42 2
43 1
45 2
46 1
47 1
48 1
51 1
53 1
56 1
57 1
59 1
61 1
62 2
64 1
66 1
71 1
75 1
77 2
85 1
100 1
110 1
116 1
151 1
162 1
168 1
182 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 19064 2810 6.784342
Contacts/Locations 8529 2404 3.547837
Recruitment Status 4427 2462 1.798132
Study Design 3294 2138 1.540692
None (earliest Version on record) 3109 3109 1.000000
Outcome Measures 2617 1561 1.676489
Sponsor/Collaborators 2167 1382 1.568017
Arms 1930 1223 1.578087
Interventions 1930 1223 1.578087
Study Identification 1867 1171 1.594364
Eligibility 1859 1147 1.620750
Study Description 1834 1102 1.664247
Oversight 1133 919 1.232862
References 899 572 1.571678
Conditions 645 440 1.465909
Results 619 619 1.000000
More Information 470 297 1.582492
IPDSharing 361 340 1.061765
Results Submission Events 210 210 1.000000
Baseline Characteristics 157 139 1.129496
Documents 150 132 1.136364
Reported Adverse Events 116 109 1.064220
Participant Flow 96 89 1.078652
2020 Study Status 1 1 1.000000
Quality Control Review has not concludedReturned: June 11 1 1 1.000000

Enrollment Metrics by Phase

Measure Early.Phase.1 N.A Phase.1 Phase.1.Phase.2 Phase.2 Phase.2.Phase.3 Phase.3 Phase.4
Min. 2 2.000 3.0000 4.0000 3.0000 8.0000 2.0000 2.0000
1st Qu. 17 43.000 20.0000 20.0000 35.0000 55.0000 139.0000 36.5000
Median 32 90.000 36.0000 40.0000 74.0000 90.0000 328.5000 86.0000
Mean 86 265.896 129.2381 191.8679 148.7151 186.7342 404.1333 202.2584
3rd Qu. 78 200.000 71.0000 74.0000 174.0000 256.0000 534.7500 206.2500
Max. 1247 25871.000 8231.0000 5000.0000 1197.0000 1326.0000 3000.0000 4000.0000

Trial Group Type

group_type Group_Count
Experimental 3131
Active Comparator 1355
Placebo Comparator 749
No Intervention 507
NA 269
Other 258
Sham Comparator 140

Intervention Model

intervention_model Study_Count
Parallel Assignment 2236
Single Group Assignment 569
Crossover Assignment 155
Factorial Assignment 87
NA 43
Sequential Assignment 19

Primary Purpose

primary_purpose Study_Count
Treatment 2276
Prevention 271
Health Services Research 125
Supportive Care 125
Basic Science 105
Other 98
NA 47
Diagnostic 33
Screening 21
Device Feasibility 6
Educational/Counseling/Training 2

Observational Studies

Studies by Country

Country Study_Count
United States 183
NA 39
Canada 18
France 14
Germany 14
United Kingdom 14
Norway 13
Spain 12
Denmark 10
Turkey 9
China 7
Israel 6
Singapore 5
Taiwan 5
Thailand 5
Austria 4
Korea, Republic of 4
Belgium 3
Brazil 3
Greece 3
India 3
Italy 3
Poland 3
Japan 2
Netherlands 2
Pakistan 2
Russian Federation 2
Switzerland 2
Argentina 1
Austria|China|Hong Kong|Israel|Lebanon|Malaysia|Mexico|Philippines|Saudi Arabia|Singapore|Taiwan|Thailand|United Arab Emirates 1
Austria|France|Germany|Italy|Netherlands|Spain|Switzerland|United Kingdom 1
Chile 1
China|Hong Kong 1
Congo, The Democratic Republic of the 1
Denmark|Netherlands|Sweden 1
Egypt 1
Finland 1
Hong Kong 1
Indonesia 1
Iran, Islamic Republic of 1
Malawi 1
Malaysia 1
Mexico 1
Portugal 1
Puerto Rico 1
South Africa 1
Sweden 1
Trinidad and Tobago 1
United States|Albania|Australia|Czechia|France|Germany|Hong Kong|Israel|Italy|Lebanon|Norway|Poland|Spain|Sweden|Taiwan 1
United States|Canada|France|Italy 1
United States|Singapore 1
United States|United Kingdom 1

Sites per Study

Site_count Study_Count
1 328
2 30
3 11
4 6
5 6
6 2
7 1
8 1
10 4
14 1
15 2
16 1
17 2
20 1
22 1
23 1
24 2
25 1
27 1
29 2
34 1
47 1
48 1
55 1
57 2
72 1
91 1
106 1
238 1

Number of Updates

Count of Versions Count of Studies
1 47
2 86
3 48
4 53
5 39
6 27
7 26
8 12
9 11
10 3
11 4
12 4
13 4
14 7
15 1
17 5
18 2
20 3
21 3
22 1
23 2
25 1
26 1
28 2
31 2
33 1
34 1
38 1
45 1
48 1
49 1
52 1
54 1
55 1
60 1
62 2
81 1
97 1
106 1
112 1
143 1
159 1
167 1
181 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 3293 367 8.972752
Contacts/Locations 809 281 2.879004
Study Description 717 142 5.049296
Study Design 474 258 1.837209
Recruitment Status 471 288 1.635417
None (earliest Version on record) 414 414 1.000000
Eligibility 358 173 2.069364
Sponsor/Collaborators 228 150 1.520000
Outcome Measures 207 137 1.510949
Study Identification 195 134 1.455224
References 188 74 2.540541
Groups 138 99 1.393939
Interventions 138 99 1.393939
Oversight 131 114 1.149123
Conditions 100 64 1.562500
IPDSharing 30 28 1.071429
Results 27 27 1.000000
More Information 14 8 1.750000
Results Submission Events 8 8 1.000000
Documents 6 6 1.000000
Baseline Characteristics 5 5 1.000000
Participant Flow 3 3 1.000000
Reported Adverse Events 3 2 1.500000

Enrollment Metrics

Measure Observational
Min 4.000
1st Qu 70.750
Median 158.000
Mean 1906.865
3rd Qu 543.500
Max 186394.000

Observation Model

observational_model Study_Count
Cohort 197
NA 54
Case-Control 45
Case-Only 44
Case Control 31
Other 22
Ecologic or Community 8
Defined Population 5
Case-Crossover 3
Defined Population, Natural History 2
Family-Based 2
Natural History 1

Time Perspective

time_perspective Study_Count
Prospective 254
Cross-Sectional 78
Retrospective 34
NA 32
Other 8
Cross-Sectional, Prospective 4
Cross-Sectional, Retrospective 3
Longitudinal, Retrospective/Prospective 1

Registries

Studies by Country

Country Study_Count
United States 5
China 4
NA 4
Canada 3
Turkey 2
Argentina 1
Austria|Belgium|Germany|United Kingdom 1
Belgium 1
Denmark 1
France 1
Israel 1
Poland 1
Taiwan 1
Vietnam 1

Sites per Study

Site_count Study_Count
1 23
2 1
8 1
12 1
16 1

Number of Updates

Count of Versions Count of Studies
1 9
2 4
3 4
4 4
5 3
7 1
12 1
13 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 65 18 3.611111
Contacts/Locations 28 13 2.153846
None (earliest Version on record) 27 27 1.000000
Recruitment Status 14 12 1.166667
Outcome Measures 13 10 1.300000
Study Design 10 10 1.000000
Eligibility 5 4 1.250000
Oversight 5 5 1.000000
Study Identification 4 4 1.000000
Groups 3 2 1.500000
Interventions 3 2 1.500000
Sponsor/Collaborators 3 2 1.500000
Study Description 3 2 1.500000
Conditions 2 2 1.000000
IPDSharing 1 1 1.000000
References 1 1 1.000000

Enrollment Metrics

Measure Registries
Min 20.000
1st Qu 87.000
Median 300.000
Mean 1832.037
3rd Qu 802.500
Max 30000.000

Registry Model

observational_model Study_Count
Cohort 24
Case-Control 2
Family-Based 1

Time Perspective

time_perspective Study_Count
Prospective 23
Cross-Sectional 3
Other 1

Follow-up

target_duration Study_Count
1 Year 3
6 Months 3
1 Month 2
1 Week 2
10 Years 2
12 Months 2
12 Weeks 2
3 Years 2
5 Years 2
2 Weeks 1
2 Years 1
24 Months 1
3 Months 1
6 Weeks 1
7 Days 1
9 Months 1